After merge fixes

Some bigger code changes was necessary becasue of the multi-table-update and the new HANDLER code


include/hash.h:
  Added back function that's was used in 4.0
mysql-test/r/delete.result:
  Update results after merge
mysql-test/r/flush_table.result:
  Update results after merge
mysql-test/r/func_str.result:
  Update results after merge
mysql-test/r/handler.result:
  Update results after merge
  Change is big becasue in MySQL 4.1 you are not allowed to qualify the handler alias with a databasename
mysql-test/r/multi_update.result:
  More startup cleanups
mysql-test/r/rename.result:
  More startup-cleanups
mysql-test/r/select.result:
  More startup cleanups
mysql-test/r/show_check.result:
  More startup-cleanups
mysql-test/t/ctype_latin1_de.test:
  Cleanup
mysql-test/t/derived.test:
  Portability fix
mysql-test/t/handler.test:
  Update results after merge
  Change is big becasue in MySQL 4.1 you are not allowed to qualify the handler alias with a databasename
mysql-test/t/multi_update.test:
  More startup cleanups
mysql-test/t/range.test:
  More comments
mysql-test/t/rename.test:
  More startup cleanups
mysql-test/t/select.test:
  More startup cleanups
mysql-test/t/show_check.test:
  More startup cleanups
mysql-test/t/type_timestamp.test:
  Add back test deleted during merge
sql/item_cmpfunc.cc:
  After merge fixes
sql/item_func.cc:
  Remove compiler warning
sql/mysql_priv.h:
  After merge fixes
sql/mysqld.cc:
  After merge fixes
sql/sql_acl.cc:
  More debugging
sql/sql_base.cc:
  After merge fixes
  (This fix was needed bacause of multi-table-update reopens tables)
sql/sql_handler.cc:
  After merge fixes
sql/sql_lex.h:
  After merge fixes
sql/sql_select.cc:
  After merge fixes
sql/sql_show.cc:
  After merge fixes
sql/sql_table.cc:
  After merge fixes
  Simple cleanup of mysql_discard_or_import_tablespace
sql/sql_update.cc:
  After merge fixes
  Rework mysql_multi_update to take into account derived tables.
sql/sql_yacc.yy:
  After merge fixes

sql/sql_select.cc

@@ -7188,7 +7188,7 @@ test_if_skip_sort_order(JOIN_TAB *tab,ORDER *order,ha_rows select_limit,
       if (keys.is_set(nr))
       {
 	int flag;
-	if (flag=test_if_order_by_key(order, table, nr, &not_used))
+	if ((flag= test_if_order_by_key(order, table, nr, &not_used)))
 	{
 	  if (!no_changes)
 	  {